Django Howto筛选出属于特定国家/地区的用户，而不是所有用户

Question

Apologize if the code below is not up to a decent programer, as i am not related to computers at all, but i would like to automate a tedious process and i find Django just interesting.. and for the life of me i can not just simply find the answer.

Having the following models.py i would like to filter out the users that belongs to a particular country and not all users, and save this information on a sqlite3 db

class Country(models.Model):
    name = models.CharField(max_length=50)  

    def __unicode__(self):
        return self.name

    class Meta:
        verbose_name = 'Countries Uploaded'

class Users(models.Model):
    name = models.CharField(max_length=50) 
    cUsers = models.ForeignKey(Country)

    def __unicode__(self):
       return self.name

    class Meta:
        verbose_name = 'Users on a country'

class GoalsinCountry(models.Model):
    Country = models.ForeignKey(VideoTopic)
    'HERE I WOULD LIKE TO SEE THE USERS IN EACH COUNTRY'
    name = models.CharField(max_length=50)  
    descr = models.TextField(blank=True, null=True)

    def __unicode__(self):
        return self.name
    class Meta:
        verbose_name = 'Goals Topic'

Would this be possible to do with Django? is there any working example?

Answer 1

Try:

Users.objects.exclude(cUsers__name='Some Country')

See: https://docs.djangoproject.com/en/dev/topics/db/queries/#lookups-that-span-relationships